.Big_box{
    width:100vw;
    height:100vh;
    background-color: gainsboro;
}
.box{
    width:100vw;
    height:200px;
    background-color: white;
}
.inp{
    margin-bottom: 20px;
}
.select_huati{
    width:70px;
    height:30px;
    background-color: gainsboro;
    border:0;
    border-radius: 20px;
}